| 摘要 |
An alarm for detecting the unauthorized movement of an object includes a motion detector, programmable microprocessor and an audible alarm contained within a housing. The motion detector utilizes a series of radially extending electrical contacts together with a peripheral electrical contact ring that encircles the perimeter of the outside edges of the radially extending electrical contacts. A metallic ball is provided within the electrical contact ring and is of sufficient size that it can roll freely within the interior of the ring. The programmable microprocessor has a key pad for programming the processor to detect when an electrical circuit is formed by said contact ring, ball and any radially extending contact and to detect when this circuit is broken by movement of the object. The audible alarm sounds when the electrical circuit is broken. The microprocessor and motion detector are mounted on a first circuit board and the key pad is mounted on a second circuit board mounted above the first circuit board within the housing.
|
